[dgemm]

I'd be curious if you have any insight on why the tracking apps for buses are so inaccurate - OneBusAway but also Google maps and the others. The estimates are often off in one way or another and sometimes a bus just doesn't show up at all. I assume the problem is with the source data but I'd be curious if you have insight into just what causes it to be so unreliable. I'm in Seattle FWIW